Overview
- High-resolution spectra taken with the VLT X‑Shooter and analyzed in late October 2026 show emission lines with four distinct peaks, a pattern best explained by two separate rotating gas rings at different distances from the white dwarf.
- The inner and outer rings contain different elements: the inner ring shows clear magnesium lines while the outer ring is notably magnesium-poor, indicating the rings come from different source material or different layers of a disrupted body.
- The authors model ring radii from the spectra and find a clear gap between the rings; archival spectra from 2021 and 2023 match the new data, showing the two-ring pattern has been stable for more than two years.
- To keep the rings separate and replenished, the team proposes two surviving planetesimals—an asteroid-scale body in the inner ring and a Pluto- or Moon-scale body in the outer ring—but those objects have not been directly detected and remain a hypothesis.
- Confirming the cause of the double-ring structure requires further observations and modeling, and the system offers a rare observational window into how planetary material can persist and evolve after a star becomes a white dwarf.